Java Online Compiler
Run Java code online in VulnTech's browser-side compiler. Write Java programs, view terminal output, stop runs, and use execution timeouts.
Run Java Online in Your Browser
Use the Java compiler for class-based beginner programs with System.out, Scanner input, loops, methods, and exceptions. Java runs experimentally through a browser-side WebAssembly JVM.
Supported Languages
Java support focuses on practical learning examples:
- System.out output
- Scanner input
- variables and arrays
- loops
- methods
- Java exceptions
Browser-Side Execution
Code execution stays browser-side through Web Workers and WebAssembly runtimes where needed. Runtimes are lazy-loaded only when the selected language needs them, and the server-side execution endpoint remains disabled.
Features
- Browser-side Java runtime
- terminal output for System.out
- stdin bridge for basic Scanner exercises
- timeouts for long-running code
Practice Ideas
- Use Scanner to read strings and integers from the terminal.
- Practice class-based beginner programs with methods and loops.
- Handle simple exceptions and inspect Java terminal output.
Example Exercises
Limitations
- Java support is experimental
- The first Java run can take longer while the JVM loads
- Desktop-specific APIs and external libraries are restricted
FAQ
Is Java support stable?
Java is available as an experimental browser-side runtime, suitable for learning exercises and small programs.
Can I use Scanner?
Basic Scanner input can work through the compiler terminal stdin bridge.
Why does Java start slowly sometimes?
The browser-side JVM is loaded lazily, so the first Java run may need extra startup time.